Emission factors for transport 

These datasets contain fleet weighted road transport emission factors by vehicle type, for hot exhaust, cold start exhaust, evaporative emissions and tyre and brake wear; transport primary NO₂ emission factors; NO_x speed-related emission functions (COPERT 4v8.1) and vehicle fleet composition projections (Base 2011).

Emission factor	Notes
Fleet Weighted Road Transport Emission Factor 2011 (XLSX)	Guidance Note - 2011 (PDF)
NOx speed-related emission functions (COPERT 4v8.1) (XLS)	Guidance note on emission degradation method for NOx (PDF)
Primary NO2 Emission factors for road transport (2013 version) (XLS)	Primary NO2 Emission factors for Road Vehicles: 2013 version Guidance Note (PDF)
	Primary NO2 Emission Factors for Aviation and Other Transport Sources - Guidance (PDF)
New vehicle fleet composition projections (Base 2011) (XLS)
Alternative vehicle technology emission factors (PDF)

Archived versions

These versions have been superceded by the more recent versions above.  The factors within them may not be directly comparable with more recent versions due to changes in the methods and raw emission factors used to derive them.

Emission factor	Notes
Fleet Weighted Road Transport Emission Factor 2010 (XLS)	Guidance Note (PDF)
Fleet Weighted Road Transport Emission Factor 2008 (XLS)	Guidance Note (PDF)
Primary NO2 Emission Factors (2012 version) (XLS)	Primary NO2 Emission Factors for Road Vehicles - 2012 version Guidance (PDF)

Page last modified: 24 April 2013